How/to - Stimulating Sponge Growth?

[DiazE]

I've had my rock for over a year and I don't have much sponges left. My lighting may be a little too much; it's a dual 150 mh.
How can I stimulate more sponge growth?
Can I scrape some off the rock and transfer it to the reef rubble down in the sump with no light?

I would love to have heavy sponge growth on my rocks!
Any suggestions - please!
:(

[HowardW]

Lower lighting, good flow, and dose silicate.

[DiazE]

<a href=showthread.php?s=&postid=12922228#post12922228 target=_blank>Originally posted</a> by HowardW
Lower lighting, good flow, and dose silicate.
How can I dose silicate? Isn't that harmful to the reef or is it a form of calcium?:confused: